From 1894 to 1917 the Illinois State Laboratory of Natural History (since merged in the Natural History Survey of the State), of which the senior author of this paper was director, was active in quantitative studies of the plankton of the rivers and lakes of Illinois, making common use, in securing collections, of a ring net of very fine mesh, hauling it definite distances and at a fixed rate, measuring the product of each haul, identifying and sometimes counting the plankton organisms collected, bringing into comparison by this means the yield of different waters, situations, and seasons, and drawing such inferences as to cause and condition as were warranted by the data so obtained.
Publisher
Champaign : Illinois Natural History Survey
Series/Report Name or Number
Illinois Natural History Survey Bulletin; v. 014, no. 01
ISSN
0073-4918
Type of Resource
text
Language
en
Permalink
http://hdl.handle.net/2142/45977
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